When I went to say goodbye to Anna, she _____________ the piano.
| A．is playing | B．plays |
| C．was playing | D．played |
Alice was playing in the park while I __________my homework at home.
| A．do | B．did | C．am doing | D．was doing |
—Chris, could you help me __________my dog while I'm on holiday?
—Sure. I'll take good care of it.
| A．think about | B．ask for |
| C．look for | D．look after |
_________have a try again? I’m sure you can do it.
| A．Why not | B．How about |
| C．What about | D．Why don’t |
I think we all need to help animals live __________.
| A．in time | B．in danger | C．in peace | D．in trouble |
Everyone __________go through the security check（安检） when entering the Bird’s Nest stadium.
| A．can | B．may | C．must | D．might |